*{
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}
.one{
	width: 1200px;
	margin:50px auto;
}
.two{
	width: 33.3333333%;
	height: 200px;
	background: lightpink;
	float: left;
	text-align: center;
}
@media (max-width: 600px){
	.one{
		margin: auto;
		width: 80%;
	}
	.two{
		width: 100%;
		background: red;
	}
}




.clearfix:before,
.clearfix:after{
	display: block;
	content: "";
	clear: both;
}
